Re: [PATCH v4 3/5] locking/rwsem: Change waiter->hanodff_set to a handoff_state enum

[Waiman Long <longman@redhat.com>]

On 10/24/22 14:25, john.p.donnelly@oracle.com wrote:
> On 10/24/22 12:44 PM, Waiman Long wrote:
>> Change the boolean waiter->handoff_set to an enum type so that we can
>> have more states in some later patches. Also use READ_ONCE() outside
>> wait_lock critical sections for read and WRITE_ONCE() inside wait_lock
>> critical sections for write for proper synchronization. There is no
>> functional change.
>
> Hi,
>
> Do we need
>
>
> Fixes: d257cc8cb8d5 ("locking/rwsem: Make handoff bit handling more 
> consistent")
>
> Fixes: 91d2a812dfb9 ("locking/rwsem: Make handoff writer 
> optimistically spin on owner")
>
> Cc: stable@vger.kernel.org
>
>
> clauses added to patches 3,4,5 so they are all picked up in one series ?
>
> Thank you,
>
> John.

I am not planning to do that. The handoff code rewrite represent a 
moderate amount of changes. So I don't want them to be backported to 
stable in case there are some hidden bugs inside. That is why I have 
patch 2 is essentially reverted in patch 4.

Cheers,
Longman